Find Volume and Surface Area of Tube Shape Donut

Surface Area of the Torus : If we divide the torus into k cylinders each having length l, now consider the division of the torus into k cylinders each having the length l, curved surface area of each such cylinder will be 2Πrl; consequently the surface area of the torus will be 2Πrlk and or we can say the surface area of the torus as 4Π2rR.
Volume of the Torus : If we divide the torus into k cylinders each of length l; then the volume of each cylinder will be Πr2l. Volume of the torus will be the sum of the volumes of these k cylinders, Πr2lk. The volume of the torus to be equal to 2Π2r2R.
 Minor Radius (r) = m Major Radius (R) = m Tube Shape Donut Surface Area = m2 Volume = m3